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arXiv · 2010.00032

Efficient hybrid-mode excitation in plasmonic nanoantennas by tightly focused higher-order vector beams

Xiaorun Zang·Godofredo Bautista·Léo Turquet·Tero Setälä·Martti Kauranen·Jari Turunen
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Abstract

Efficient optical excitation of hybridized plasmon modes in nanoantennas is vital to achieve many promising functionalities, but it can be challenging due to a field-profile mismatch between the incident light and the hybrid mode. We present a general approach for efficient hybrid-mode excitation by focusing the incident light field in the basis of cylindrically polarized vector beams of various higher-order spiral phases. Such basis vector beams are described in the higher-order polarization states and Stokes parameters (both defined locally in polar coordinates), and visualized correspondingly on the higher-order Poincar\'e spheres. The focal field is formulated exclusively in cylindrical coordinates as a series sum of all focused beams of the associated high-order paraxial beams. Our focal field decomposition enables an analysis of hybrid-mode excitation via higher-order vector beams, and thus yields a straightforward design of effective mode-matching field profile in the tightly focused region.

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Xiaorun Zang, Godofredo Bautista, Léo Turquet, Tero Setälä, Martti Kauranen, Jari Turunen. 2020-09-30. Efficient hybrid-mode excitation in plasmonic nanoantennas by tightly focused higher-order vector beams. https://doi.org/10.1364/josab.412195

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